Question…… do you only listen to digital? If you listen to vinyl and/or tape….then hands down the ZROCK2 is the clear winner. While the ZBOX will warm up the sound, it’s not going to give you the flexibility of tone adjustments like the ZROCK2.
I have found that when switching from digital to vinyl, I am adjusting the ZROCK2. The bypass switch is the key player here. I will listen to an album bypassed, then turn it on to see where I want the sound to go for my liking. Even with different vinyl albums.. I find that I’m occasionally micro adjusting the ZROCK2.
In regards to digital…you will get some albums that are just “thin” for lack of a better term. The ZROCK2 will be able to make that recording more palatable. I don’t think you will find a better piece of gear with what the ZROCK2 will offer.
Here are two YouTube videos of the ZROCK2. I think this will help you. For the best results…Steve recommends listening through headphones and/or earbuds….not through your computer speakers or mobile devices.
In this first video .. you can hear how the sound changes when flips the front bypass switch. You don’t even need headphones to hear how the sound changes. It’s quite noticeable.
https://youtu.be/LfbGUBaofAM https://youtu.be/ANMFBc4AXaUDom